Fe3O4–graphene hybrids: nanoscale characterization and their enhanced electromagnetic wave absorption in gigahertz range
Abstract
Fe3O4–graphene hybrid materials have been fabricated by a simple polyol method, and their morphology, chemistry and crystal structure have been characterized at the nanoscale. It is found that each Fe3O4 nanoparticles decorated on the graphene has a polycrystalline fcc spinel structure and a uniform chemical phase. Raman spectroscopy, Fourier transform infrared spectroscopy, thermogravimetry/differential thermal analysis, X-ray diffraction, and transmission electron microscopy suggest that Fe3O4 nanoparticles are chemically bonded to the graphene sheets. Electromagnetic wave absorption shows that the material has a reflection loss exceeding ‑10 dB in 7.5–18 GHz for an absorber thickness of 1.48–3 mm, accompanying a maximum reflection loss value of ‑30.1 dB at a 1.48-mm matching thickness and 17.2-GHz matching frequency. Theoretic analysis shows that the electromagnetic wave absorption behavior obeys quarter-wave principles. The results suggest that the magnetic Fe3O4–graphene hybrids are good candidates for the use as a light-weight electromagnetic wave-absorbing material in X- and Ku-bands.
- Publication:
-
Journal of Nanoparticle Research
- Pub Date:
- March 2013
- DOI:
- 10.1007/s11051-013-1472-1
- Bibcode:
- 2013JNR....15.1472L
- Keywords:
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- Fe<SUB>3</SUB>O<SUB>4</SUB>;
- Graphene;
- Hybrids;
- Magnetic;
- Electromagnetic